From 21e68d2c9ea5c336fc839859287f31249fcedf98 Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Tue, 23 Jun 2020 08:03:30 +0200
Subject: [PATCH] Can delete permanently a conversation

---
 src/helpers/conversations_helper.rs | 31 +++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/helpers/conversations_helper.rs b/src/helpers/conversations_helper.rs
index 42496fc..c15c288 100644
--- a/src/helpers/conversations_helper.rs
+++ b/src/helpers/conversations_helper.rs
@@ -8,11 +8,11 @@ use crate::data::conversation_message::ConversationMessage;
 use crate::data::error::{ExecError, ResultBoxError};
 use crate::data::new_conversation::NewConversation;
 use crate::data::new_conversation_message::NewConversationMessage;
+use crate::data::unread_conversation::UnreadConversation;
 use crate::data::user::UserID;
 use crate::helpers::database;
 use crate::helpers::database::InsertQuery;
 use crate::utils::date_utils::time;
-use crate::data::unread_conversation::UnreadConversation;
 use crate::utils::user_data_utils::user_data_path;
 
 /// Create a new conversation. This method returns the ID of the created conversation
@@ -253,6 +253,13 @@ pub fn get_user_messages_for_conversations(conv_id: u64, user_id: UserID) -> Res
         .exec(db_to_conversation_message)
 }
 
+/// Get the entire list of messages of a given conversation
+pub fn get_all_messages(conv_id: u64) -> ResultBoxError<Vec<ConversationMessage>> {
+    database::QueryInfo::new(CONV_MESSAGES_TABLE)
+        .cond_u64("conv_id", conv_id)
+        .exec(db_to_conversation_message)
+}
+
 /// Send a new conversation message
 pub fn send_message(msg: &NewConversationMessage) -> ResultBoxError<()> {
     let t = time();
@@ -349,12 +356,32 @@ pub fn mark_user_seen(conv_id: u64, user_id: UserID) -> ResultBoxError<()> {
 /// Remove a user from a conversation
 pub fn remove_user_from_conversation(user_id: UserID, conv_id: u64) -> ResultBoxError<()> {
     if is_user_moderator(user_id, conv_id)? {
-        unimplemented!()
+        delete_conversation(conv_id)
     } else {
         delete_member(user_id, conv_id)
     }
 }
 
+/// Remove permanently a conversation
+pub fn delete_conversation(conv_id: u64) -> ResultBoxError<()> {
+    // Delete all the messages of the conversations
+    for message in get_all_messages(conv_id)? {
+        delete_message(&message)?;
+    }
+
+    // Delete all the members of the conversation
+    database::DeleteQuery::new(CONV_USERS_TABLE)
+        .cond_u64("conv_id", conv_id)
+        .exec()?;
+
+    // Delete the conversation entry itself
+    database::DeleteQuery::new(CONV_LIST_TABLE)
+        .cond_u64("id", conv_id)
+        .exec()?;
+
+    Ok(())
+}
+
 /// Delete a conversation membership
 pub fn delete_member(user_id: UserID, conv_id: u64) -> ResultBoxError<()> {
     for msg in get_user_messages_for_conversations(conv_id, user_id)? {